May sound like a dumb question but i need to know

Ok, you know when your completed with a story and you have to mark it as complete? Well there is this story I posted on here and I need to mark it as complete. i been workin on it quite awhile and I posted it as I'm working on it but I just need to know how to mark it as complete. If I don't I may get introuble with the mibba staff and I don't want that to happen. I love it on mibba and I don't wanna get banned for something I did'nt know how to do. I know this question sounds really stupid but can someone please tell me?